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There are quarter to half dollar sized parts of colonized substrate in my jars. Next to one of these is a small patch of green contamination. I know I have to toss it, but instead of wasting the whole jar, can I cut out the other three sections of fully colonized material and use it to colonize other (sterile) jars?

if you really cant throw them out try this...put the few good pieces in a miny bleach dunk ( 1 part clorox to 100 water) then use as sterile as possible technique to clone this. i use the liquid mycelium tek. good luck but prob. just throw it out!